三级联动的方式实现年月日的选择_年月日用三个下拉框联动实现-优快云博客

本文介绍如何通过HTML、CSS和JavaScript实现三级联动的年月日选择功能，常见于网页表单中。案例展示了一个完整的实现方式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

表单联动切换是网页中比较常见的功能，下面是一个小的案例实现年月日三个下拉列表的联动功能：

<!DOCTYPE html>

<html>
   <head>
       <meta charset="UTF-8">
       <title></title>
       <script type="text/javascript">
           //用数组存放月份
           function load_months(){
           return ["1","2","3","4","5","6","7","8","9","10","11","12"];
       }

       //用数组存放不同月份的天数，一个月可能有28天，29天，30天，31天
       function load_days(){
           return [
               ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31"],
               ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30"],
               ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29"],
               ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28"]
           ];
       }

var months=load_months();
var days=load_days();
       function change_month(){
           //1获取年份的序列号
           var s=document.getElementById("year");
           var index=s.value;

           //获取年相应月份的下标
           var c=months;
           //删除月份选项中原有的option
           var type=document.getElementById("month");
           type.innerHTML="<option>请选择</option>";
           //将机型放入到动态生成的下拉选中
           if (c) {
               for (var i=0;i<c.length;i++) {
                   var opt=document.createElement("option");
                   opt.innerHTML=c[i];
                   opt.value=i+1;
                   type.appendChild(opt);
               }
           }
       }
       function change_day(){